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Plaster washers for sagging plaster ceiling: what screws to use?

Plaster washers for sagging plaster ceiling: what screws to use?


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Old 08-25-13, 01:00 PM
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Plaster washers for sagging plaster ceiling: what screws to use?

What screws to use with plaster washers in a sagging plaster ceiling? Plaster is 3/8, lath is 1/2. Should I use 6 or 8 thickness? Coarse thread? 1-5/8 long? or 1-1/4 long is sufficient? And regular drywall screws or deck screws to prevent corrosion emanating from plaster? Thanks.
 
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Old 08-25-13, 01:47 PM
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Let me know if this works on a ceiling as well; Plaster and Lath Reconstruction/Restoration - YouTube Lot more gravity weight, maybe, I haven't tried it up there yet...

Gary
 
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Old 08-25-13, 01:59 PM
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I've used deck screws in the past to repair plaster ceilings. Haven't noticed any rusting problems. If you set them in slightly and plaster over them you shouldn't have a problem with any screw.
 
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Old 08-25-13, 02:32 PM
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Thanks. Do you think 1-1/4 screws are too short and 1-5/8 should be used?
 
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Old 08-25-13, 02:52 PM
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Many times the lathe starts to separate from the beams too.
If you putting the screws in at a beam use the 1-5/8"
 
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Old 08-26-13, 05:08 AM
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"Let me know if this works on a ceiling as well; Plaster and Lath Reconstruction/Restoration - YouTube Lot more gravity weight, maybe, I haven't tried it up there yet..."

I haven't used the expanding foam method, I used this method on a large section of a 100 + year old heavy plaster ceiling with some heavy decorative elements. I didn't buy the expensive kit. I used Liquid nails and latex admix as a conditioner, box of 1/4X1 1 1/4" fender washers and 2 1/4"" course drywall screws. All supplies available at the local big box. It took maybe 15 tubes of adhesive to do about 60% of a 14X14 area. The screws were left in at least a week, sometimes longer til I could get back to the job. The ceiling is quite solid now. It's important to vacuum each hole but on one small section I forgot to and it still worked, I guess squirting the latex flushes the dust away. Space the screws/washers fairly close 8X8" - 10"X10" grid depending on severity of sag. I had to stop when I ran out of 100 washers and let it set a week then move on to the next.
 
 

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